diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ea31c2..13a3bde 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
  - `protontricks -c` and `protontricks-launch` now use the current working directory instead of the game's installation directory. `--cwd-app` can be used to restore old behavior. Scripts can also `$STEAM_APP_PATH` environment variable to determine the game's installation directory; this has been supported (albeit undocumented) since 1.8.0.
  - `protontricks` will now launch GUI if no arguments were provided
 
+### Fixed
+ - Fix crash when parsing appinfo.vdf V29 version in new Steam client version
+
 ## [1.11.1] - 2024-02-20
 ### Fixed
  - Fix Protontricks crash when custom Proton has an invalid or empty `compatibilitytool.vdf` manifest
diff --git a/src/protontricks/steam.py b/src/protontricks/steam.py
index a28e2f0..644124c 100644
--- a/src/protontricks/steam.py
+++ b/src/protontricks/steam.py
@@ -483,6 +483,7 @@ def find_legacy_steam_runtime_path(steam_root):
 
 APPINFO_STRUCT_HEADER = "<4sL"
 APPINFO_V28_STRUCT_SECTION = "<LLLLQ20sL20s"
+APPINFO_V29_STRUCT_SECTION = "<LLLLQ20sL20s"
 
 
 def iter_appinfo_sections(path):
@@ -518,6 +519,59 @@ def _iter_v28_appinfo(data, start):
             if i == len(data) - 4:
                 return
 
+    def _iter_v29_appinfo(data, start):
+        """
+        Parse and iterate appinfo.vdf version 29.
+        """
+        i = start
+
+        # The header contains the offset to the key table
+        key_table_offset = struct.unpack("<q", data[i:i+8])[0]
+        key_table = []
+
+        key_count = struct.unpack(
+            "<i", data[key_table_offset:key_table_offset+4]
+        )[0]
+
+        table_i = key_table_offset + 4
+        for _ in range(0, key_count):
+            key = bytearray()
+            while True:
+                key.append(data[table_i])
+                table_i += 1
+
+                if key[-1] == 0:
+                    key_table.append(
+                        key[0:-1].decode("utf-8", errors="replace")
+                    )
+                    break
+
+        i += 8
+
+        section_size = struct.calcsize(APPINFO_V29_STRUCT_SECTION)
+        while True:
+            # We don't need any of the fields besides 'entry_size',
+            # which is used to determine the length of the variable-length VDF
+            # field.
+            # Still, here they are for posterity's sake.
+            (appid, entry_size, infostate, last_updated, access_token,
+             sha_hash, change_number, vdf_sha_hash) = struct.unpack(
+                APPINFO_V29_STRUCT_SECTION, data[i:i+section_size])
+            vdf_section_size = entry_size - (section_size - 8)
+
+            i += section_size
+
+            vdf_d = vdf.binary_loads(
+                data[i:i+vdf_section_size], key_table=key_table
+            )
+            vdf_d = lower_dict(vdf_d)
+            yield vdf_d
+
+            i += vdf_section_size
+
+            if i == key_table_offset - 4:
+                return
+
     logger.debug("Loading appinfo.vdf in %s", path)
 
     # appinfo.vdf is not actually a (binary) VDF file, but a binary file
@@ -539,6 +593,8 @@ def _iter_v28_appinfo(data, start):
 
     if magic == b'(DV\x07':
         yield from _iter_v28_appinfo(data, i)
+    elif magic == b')DV\x07':
+        yield from _iter_v29_appinfo(data, i)
     else:
         raise SyntaxError(
             "Invalid file magic number. The appinfo.vdf version might not be "